Kavli Affiliate: Roberto Maiolino
| First 5 Authors: Christa DeCoursey, Eiichi Egami, Justin D. R. Pierel, Fengwu Sun, Armin Rest
| Summary:
The JWST Advanced Deep Extragalactic Survey (JADES) is a multi-cycle JWST
program that has taken among the deepest near-infrared images to date (down to
$sim$30.5 ABmag) over $sim$25 arcmin$^2$ in the GOODS-S field in two sets of
observations with one year of separation. This presented the first opportunity
to systematically search for transients, mostly supernovae (SNe), out to $z>$2.
We found 79 SNe: 38 at $z<$2, 23 at 2$<z<$3, 8 at 3$<z<$4, 7 at 4$<z<$5, and 3
with undetermined redshifts, where the redshifts are predominantly based on
spectroscopic or highly reliable JADES photometric redshifts of the host
galaxies. At this depth, the detection rate is $sim$1-2 per arcmin$^2$ per
year, demonstrating the power of JWST as a supernova discovery machine. We also
conducted multi-band follow-up NIRCam observations of a subset of the SNe to
better constrain their light curves and classify their types. Here, we present
the survey, sample, search parameters, spectral energy distributions (SEDs),
light curves, and classifications. Even at $zgeq$2, the NIRCam data quality is
such that we can perform multi-epoch light-curve fitting to classify supernovae
with a reasonable degree of confidence. The multi-epoch SN sample includes a
Type Ia SN at $z_{spec}= $ 2.91, Type IIP SN at $z_{spec}= $ 3.61, and a Type
Ic-BL SN at $z_{spec}= $ 2.845. We also found that two $zsim$16 galaxy
candidates from the first imaging epoch were actually transients that faded in
the second epoch, illustrating the possibility that moderate/high-redshift SNe
could mimic high-redshift dropout galaxies.
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